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i was running sub 50 with about 3-4 months of dedicated training in my 30s, maybe about 46-47m or so... a lot of 5k speedwork to get there, i don't think i could do that again.
still some people with natural athleticism would wipe the floor with me who don't even run. running has so much to do with natural biomechanics than it has to do with cardio, its crazy.
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